in 1968, humphry was down 15 points to nixon. nixon won and it was by less than 1%. in 19786, there was a 34-point lead over ford. after three debates ford cut the lead to five points and led in the final gallup poll though narrowly lost. in 1980, jimmy carter had consistent advantage in the polls overarmed reagan but the final debate changed everything. polls showing a lead over romney in the key battleground states, democratic pollster who worked for jimmy carter said finding the right example can be tricky. >> we know from the exit polls and others that republicans tend to respond to the polls less than often times. from the news organizations. less than do democrats. >> in 1988, george bush managed a huge swing. dukakis was leading after the democratic convention but lost to bush. in 1992, the incumbent president was down nine points and died with bill clinton but october though clinton eventually won. former pollster questioning the assumption made in today's polls. >> these polls are assuming that you have the same high level of african-american, latino an youn